NaOH+HCL= NaCL+H2O
m(HCL)= mраствора(HCL) *массовая доля (HCL) = 30г*0,05=1,5г
m(NaOH) = (40*1,5)|36,5=1,64г
m раствора (NaOH) = m(NaOH)/МАССОВАЯ ДОЛЯ (NaOH) = 1,64г/0,04= 41,09г.
А) CuSO4 + KNO3 - реакция не идет
б) CuSO4 +2NaOH →Cu(OH)2↓ + Na2SO4
Cu(2+) + SO4(2-) + 2Na(+) + 2OH(-) →Cu(OH)2↓ + 2Na(+) +SO4(2-)
Cu(2+) +2OH(-) →Cu(OH)2↓
дано
m(Ba) = 16,44 g
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m(Ba(OH)2)-?
V(H2)-?
2Ba+2HOH-->Ba(OH)2+H2
M(Ba) = 137 g/mol
n(Ba) = m/M = 16.44 / 137 = 0.12 mol
2n(Ba) = n(Ba(OH)2)
n(Ba(OH)2) = 0.12 / 2 = 0.06 mol
M(Ba(OH)2) = 171 g/mol
m(Ba(OH)2) = n*M = 0.06 * 171 = 10.26 g
2n(Ba) = n(H2)
n(H2) = 0.06 mol
V(H2) = n*Vm = 0.06 * 22.4 = 1.344 L
ответ 10.26 г , 1.344 л
Ca+2H2O=Ca(OH)2+H2
CaO+2NaOH=Ca(OH)2+Na2O